Intermittently-operating absorption refrigerating machine



June 18, 1929. BAYER 1,717,909

INTERMITTENTLY OPERATING ABSORPTION REFRIGERATING MACHINE Filed Feb. 1928 (inventor;

. "7 wmwwa Patented June 18, 1929.

PATENT OFFICE.

JULIUS-BAYER, OF AUGSIBURG, GERMANY.

m'rnmtn'rENrLY-ornaarme ansonr'rron nnraranna'rme uaonmn Application filed February 4, 1928, Serial No.

. This invention has reference to intermittently operating absorption refrigerating machines, particularly those of comparatively restricted output,'such as are employed for domestic uses, and adapted to be shipped ready for use and with theabsorption liquid contained therein. The invention is intendedto facilitate the manipulation by unskilled users and to simplify the construction and the general arrangement of machines of the kind referred to. The invention is particularly applied to machines of this't-ype furnished with separate suction conduits and pressure conduits. 'In accordance with the previous art such machines have been provided with means adapted to automatically and periodically return the absorption fluid which has been transferred from the boiler into theevaporator, so that in the ordinary and normal course of operation the full caloric efiiciency of the machine will always be obtained. With this kind of devices however there is the diificulty that, while they are very well adapted to dispose of the absorption liquid which has been transferred from the boiler into the evaporator during one boiling operation, they fail to operate satisfactorily, whenever it is required to deal with considerable amounts of the absorbing medium, such as so will usually overflow into the evaporator during transportation of the machines, and to remove these quantities and to return them to the boiler. In order to attain this object'by means of the automatic arrangements referred to a series of boiling operations would become necessary, until the machine would be restored to a state-in which it may yield its full efiiciency. This. inconvenience however results in a very serious interruption of operation 40 with a considerable waste of useful energy, and it is moreover liable to raise suspicion 1n the mind of the user in regard to the value of the machine.

Now this invention is intended to overcome the difficulties referred to and to produce a satisfactory operation of machines. of this kind without the necessity of any particular skilled training or instructing. The machine according to this invention is provided, as vhereiribefore mentioned, with separate sue tio-n conduits and pressure conduits and moreover with 'anarrangement otherwise known and adapted to transfer a limited quantity of liquid. from the lowest part of the evaporator 56 through the suction pipe into the bOllGP-tlb 251,797, and in Germany February 7, 1927.

sorber in the beginning of each cooling period. My invention is particularly distinguished by the fact that in the suction pipe a closing valve is disposed which is to be operated at times and which is normally open and by the closing of which the suction conduit is interrupted and the pressure conduit which ex-.

tends to the bottom of the evaporator is caused to act as a suction conduit, so that by the aspirating action of the absorber the entire liquid contents of the evaporator may be sucked at once into the absorber.

Upon the accompanying drawing I have shown diagrammatically and by way of exemplification the general construction of a refrigerating machine for domestic uses. a in the drawing designates the combined boiler-absorber which is provided with the temperature regulating or modifying means, such as electrical heaters 19' and the cooling .coil 0. From the upper part of the boiler absorber a the pressure conduit d leads to the condenser e which is cooled in any'suitable manner and which is connected by-a pipe f to the pocket or sump g of the evaporator h. Into this pocket 9 of the evaporator the end portion of the suction pipe 2' is likewise disposed, the said suction pipe passing through the evaporator 71. and being provided with a small opening l disposed in the interior of a small projecting hood or extension is. The suction pipe i'is provided with a manmal course of operation this valve n is open and the mode of operation of the machine in this stage corresponds to that of the ordinary intermittentl operating absorption refrigerating mac ines. During the process of boiling the vapors of the cooling medium which have been evolved in the boiler a will ually operated closing valve n. In the norbecome condensed in the condenser e and the heating means I) and admitting the cooling water to the cooling coil 0 the suctional pressure of the boiler absorber is caused to act through the suctionpipe z upon the contents of the evaporator h, and as a result thereof and in yiew of the opening Z bein covered up, l quid will be aspirated'out of t e pocket 9 III Winch any absorbing medium will acthe return of the absorbing medium from cumulate which may have flown over into the evaporator, and this action is continued until by the lowering of the level of liquid in the evaporator the opening Z is uncovered. The evaporating stage may then commence and the vapors will flow through the opening Z and the suction pipe i into the boiler absorber a. In the normal operation of the machine When however during transportation, thus for instance by the tiltingof the machine, a

. in the machine described after the termina-- considerable portion of the contents of the boiler absorber is transferred into the evaporator the automatically operating means are no longer sufficient to release the evaporator in one operation from the absorbing medium. For this purpose the cut-off valve '07. is closed tion of the first boiling stage. By this means the suction conduit i is cut out, and the aspirating pressure of the cooled boiler-absorber 'is acting exclusivel upo'n'the deepest ortion of the evaporator y way of the con enser e and the conduit d,f, the contents of the pocket or deepest part of the evaporator being thereby transferred back into the boiler- 'absorber in one operation, so as to thereby attain the complete withdrawal of the absorbing agent from the evaporator. After this procedure the valve n is opened again, and the machine is now ready for the ordinary manner of utilization according to which at the beginning of each cooling period the ab sorbing agent which happens to have escaped into the evaporator is automatically sucked back into the boiler-absorber, so that the full arranged above the highest level of caloric efiiciency will always be obtained.-

When the cut-off valve 71. is closed, it has been found that on account of the absorption and the equalization of pressure occurring in the boiler-absorber the leg of the suction pipe 2' immersed .into the absorber will become filled with liquid up to the cut-off valve n. In order to obviate the possibility of the suction conduit 2' operating as a siphon between the boiler-absorber a and the evaporator it upon the re-opening ot the cut-off valve 11., so as to cause the contents of the absorber to flow into the evaporator, the cut-off valve n is the liquid in the boiler-absorber.

In practice modifications and changes of the specific construction herein shown by wa of exemplification may be made within the purview of m invention in accordance wit-h variable conditions of application, except as otherwise stated in the appended claims.

I claim v 1. In a refrigerating apparatus the combination with a boiler-absorber, an evaporator, communicating means between the top of the boiler-absorber and the bottom of the evaporator and including a condenser, and

additional connecting means establishing lower part of the boiler-absorber to the bottom of the evaporator, cutting-off vmeans on said conduit aboverthe highest level of said liquid, and heating means for the boiler absorber.

3. In a refrigerating apparatus in combination, a boiler-absorber, a bulk of liquid in said absorber, an evaporator, a depressed pocket in the bottom of the evaporator, communicatlng means connecting the top of the boiler-absorber with said pocket, condensing means on said communicating means, a conduit adapted to establish communication of said bulk of liquid with said ocket and apertured in the top part of t 'e evaporator, and a cut-off member in said means for varying the temperature of the boiler-absorber.

4. In a refrigerating apparatus in combination, a boiler-absorber, a bulk of vaporiz able liquid therein, an evaporator, a pocket in the lower part of the evaporator, communicating means between the top of the boiler absorber and said pocket, and a pipe conduit leading from the position of the liquid in the boiler-absorber to the bottom of the pocket, venting means on said conduit within the top portion of the evaporator and a Howregulating and flow-closing member in said conduit above the highest liquid-level occurring in the boiler-absorber, and means for varying the temperature of the boiler-absorber. v

5. In a refrigerating apparatus in combination, a boiler-absorber, a bulk of liquid therein, a closed evaporating tank, communicating and condensing means between the top of the boiler-absorber and the evaporating tank, a pipe conduit leading from the boiler-absorber at the position of the liquid therein to the lower part of said tank, venting meansin the top part of said tank and con nected to said conduit, flow controlling and and cooling means y interrupting means on said conduit intermeconduit, and

diate the boiler-absorber and the tank and above the highest liqixid-lei el occurring in the boilerabsorber, and temperature-modifying means for said boiler absorber.

6; In a refrigerating apparatus in. combination, a boiler-absorben-a bulk of vaporizable liquid therein, aelosed evaporating tank,

'communicating and condensing means. between the top ofthe hollerabsorber and the evaporating tank, a siphon-conduit immersed, '11! the interior of the bo ler-absorber and leading to the bottom of the-tank and venting nieansin said siphomcondnit in the top part of the tank, and controlling means in the siphon-conduit. 7.'In a refrigeratlng apparatus in combination, a boiler-absorber, a closed evapo-v rating tank, a conduit connecting the top of the boiler-absorber and the evaporating-tank and including a' condenser, a siphon conduit lll'llllLl'SCtl in the liquid of the boiler absorber, and adapted to connect the bottom thereof to the bottomof the evaporator-tank, flow regulating means on the siphon conduit, and

temperature modifying means in'the' boiler-' JULIUSBAYER. 

